| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.37 | 31 |
| 2015 | 0.92 | 150 |
| 2014 | 3.89 | 70 |
| 2013 | 3.51 | 87 |
| 2012 | 4.55 | 71 |
| 2011 | 1.84 | 135 |
| 2010 | 4.91 | 63 |
| 2009 | 2.56 | 107 |
| 2008 | 3.75 | 107 |
| 2007 | 7.32 | 71 |
| 2006 | 4.59 | 90 |
| 2005 | 10.1 | 23 |
| 2004 | 5.4 | 53 |
| 2003 | 2.04 | 105 |
| 2002 | 10.4 | 12 |
| 2001 | 8.37 | 22 |
| 2000 | 8.11 | 25 |
| 1999 | 9.75 | 19 |
| 1998 | 5.57 | 39 |
| 1997 | 2.09 | 91 |
| 1996 | 2.15 | 65 |
| 1995 | 4.31 | 34 |
| 1994 | 1.85 | 55 |
| 1993 | 1.62 | 56 |